Patch "crypto: af_alg - Fix socket double-free when accept fails" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

crypto: af_alg - Fix socket double-free when accept fails

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
crypto-af_alg-fix-socket-double-free-when-accept-fails.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Herbert Xu <[email protected]>
Date: Wed, 30 Dec 2015 20:24:17 +0800
Subject: crypto: af_alg - Fix socket double-free when accept fails

From: Herbert Xu <[email protected]>

commit a383292c86663bbc31ac62cc0c04fc77504636a6 upstream.

When we fail an accept(2) call we will end up freeing the socket twice, once due to the direct sk_free call and once again through newsock.

This patch fixes this by removing the sk_free call.

---
 crypto/af_alg.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

@@ -285,10 +285,8 @@ int af_alg_accept(struct sock *sk, struc
 	security_sk_clone(sk, sk2);
 
 	err = type->accept(ask->private, sk2);
-	if (err) {
-		sk_free(sk2);
+	if (err)
 		goto unlock;
-	}
 
 	sk2->sk_family = PF_ALG;
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/crypto-af_alg-disallow-bind-setkey-...-after-accept-2.patch queue-4.4/crypto-skcipher-add-crypto_skcipher_has_setkey.patch queue-4.4/crypto-algif_skcipher-add-key-check-exception-for-cipher_null.patch queue-4.4/crypto-algif_skcipher-require-setkey-before-accept-2.patch queue-4.4/crypto-algif_skcipher-add-nokey-compatibility-path.patch queue-4.4/crypto-hash-add-crypto_ahash_has_setkey.patch queue-4.4/crypto-af_alg-add-nokey-compatibility-path.patch queue-4.4/crypto-sun4i-ss-add-missing-statesize.patch queue-4.4/crypto-algif_hash-require-setkey-before-accept-2.patch queue-4.4/crypto-af_alg-fix-socket-double-free-when-accept-fails.patch